Why this?

Why after kernel compilation i get this make-kpkg command not found ?
I'm compiling kernel 2.6.8.1 and following your debian tutorial about 2.6 i'm getting on with "make deb-pkg" while it's compiling how would i do when comes time for "make-kpkg --revision=custom.1.0 kernel_image" , "make deb-pkg --revision=custom.1.0 kernel_image" ?????? would it be all right ????

... and the compiling result is a kernel panic because VFS cannot open rootdevice hda5 please append a correct root=boot option... vfs unable to mount root fs on unknown block(0,0).I suppose i have to modify grub for this to work,i thought dpkg -i did it!What about the mkinitrd ?Is that necessary for boot?